Half to saxton



(No ModeL') I A E. T. JOHNSON;

HEATING AND VBNTIL'ATING APPARATUS. A j No. 376,746. Patented Jan, 24, 1888.

MIA/8358.- //v VE/VTOR i or public building, ofwhich A represents the UNITED STATES A ENT A Erica.

EDWIN T. JOHNSON, or MINNEAPOLIS, MINNESOTA, Assienon or one HALF TO'SAXTON & PHILLIPS, or SAME PLACE.

HEATING AND VENTILATING APPARATUS.

SPECIFICATION formingpart of Letters Patent No. 376,746, dated January 24, 1858. Application filed March '15, 1887. Serial No. 230.546. (No model.) v i To all whom it may concern.-

Be it known that I, EDWIN T. JOHNSON, a

citizen of the United States, and a resident of the city of Minneapolis, county of Hennepin,

.State of Minnesota, have invented a certain In the drawings, like lett'ers'reierring to like parts, Figure 1 is a perspective view of the interior of a building, showing my invention in working position. Fig. 2 is a vertical section of one of the foul-air dampers and a part of the furnace-wall in which it is set, and Fig. 3 is a side 'elevationof apart of the same in position in the furnace-wall;

A A are rooms or chambers in a residence furnace-chamber, and A a living-room.

B is a furnace. Ois a supplementary or an .nex chamber attached to said furnace, which may be formed by simply building an additional wall along one side of the furnace-wall at a short distance from the same and closing the top and ends. In the furnace-wall, adjacent to the annex C, I set a heat-radiating plate, D, composed of galvanized iron or other suitable material, for the purpose of radiating heat from the furnace into the annex chamber 0. In the rear wall of the chamber 0 is a foul-air outlet, E, leading to the ventilatingshaft. (Not shown.) 1

F is a fresh-warm-air conduit leading from the heating-chamber of the furnace B to a register,'f, in the living-roomf G is a foul-air conduit leading from the registers 9, located near the floor of the livingroom A, to the bottom of the forward end of the annex chamber 0.

I H is a damper set in the annex chamber 0 by journals resting in boxes in the end walls of the same. This damper, \vhen in its horizontal position, divides the chamber 0 intoan upper and lower section without intercommunication, and when in its vertical position the. two sections open into one, constituting the chamber 0. The forward journal, h, of this damper H. is extended through its bearingbox, and is provided with the square endor wrench-head h, to which a crank-lever or wrench may be applied for turning the annex chamber,"pivotally supported by journals resting in boxes in the ends of the furnace wall. The forward journal, It, extends the two entirely when in its closed or vertical position.

sitions shown and a fire madein the furnace B,

chamber 0 into the heating-chamber ofthe pass back to. the room A through thewarmair line F. There is thus produced asystem of revolving air from the room to be heated -through the heating'charnber of the furnace. After the requisite initial temperature has been obtained in the living-room A the opened. The air from the room'A' then passes through conduit Einto the ventilating-shaft,

and passes thence through the flueF to the give the necessary exhaust in theventilatingthe furnace-wall, and when in its horizontal".

furnace into communication with the bottom" furnace. Inthe furnace it will be heated and into. the annex chamber 0, and thence out 95 and the fresh air is admitted tothe heatingchamber of thefurnace in the customary way living-room. Theannex chamber 0 serves to damper. K. is a similar damper of equal length set in the furnace-wall adjacent to the,

through its bearing-box to the front of-thefur- The operation of my construction is-as followsz If the dampers H and K be in the po-.

damper K is closed and the damper]?! is f r the air in the living-room A will be drawn I into the conduit G through registers g and down to and through the lower section of the shaft. The body of air admitted to the annex chamber after it has been repeatedly passed through the furnace B is at a comparatively high temperature and has a strong ascensional power. This will be intensified by the heat radiated from the heating-plate D. The exhaust up the shaft is therefore started with a strong impetus, and is thereafter easily maintained by the heat radiated through the plate D.

- It will thus be seen that my invention is of especial service in public buildings which are intermittently occupied or in which the fires are not constantly maintained, like schoolbuildings, churches, public halls, office-buildings, and similar structures. In this class of buildings the greatest difliculty is to warm the building in the first place. Itis a tedious and costly operation to raise the building itself from the cold state to the required initial temperature. After the heat is once up, as the engineers say, it is a comparatively easy matter to maintain it. The fires are always started in such buildings before the occupants come; hence change of air is unessential. The admission of fresh air may be postponed until the people arrive. It is far easier to heat one volume of air than many. I take advantage of these facts, and by revolving the same air continuously through the furnace I obtain the requisite initial temperature in much less time and at a greatly-reduced cost. It is also a matter of considerable difficulty in such buildings to start the ventilation, on account of insufficientexhaust in the ventilating-shaft. The 3 5 movement is very slow and sluggish at first. Most other systems seek to overcome this and get the initial draft by an extra fire in the bottom of the shaft. This is expensive. I dispense with it and get an equally good starting 40 impetus by mysystem of revolving air and the annex chamber 0.

What I claim, and desire to secure by Letters Patent of the United States, is as follows:

In combination, furnace B, provided with 5 the radiating-plate D, hot-air flue F, annex chamber 0, foul-air outlet E to the ventilatingshaft, conduit G from the living-rooms to said annex chamber, the damper H, journaled in the end walls of said chamber and serving to divide the same into an upper and lower section at will, and the damper K, journaled in the walls of said furnace and serving to connect or shut off said annex chamber from the bottom of said furnace, whereby the air from the living-rooms may be continuously revolved through the heatingchamber of said furnace, or be made to force its way into the ventilating-shaft at will, substantially as described.

I EDWIN T. JOHNSON. In presence of B. PHILLIPS, J12,

EMMA ELMORE. 

